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All of special relativity derives for these two principles, plus assumptions of exact conservation of momentum and energy in all cases.

All of special relativity derives for these two principles, plus assumptions of exact conservation of momentum and energy in all cases.

There are hundreds of experiments or observations that, to varying extents, "prove", "validate", or "are consistent with" special and general relativity.  A good survey may be found at [http://math.ucr.edu/home/baez/physics/Relativity/SR/experiments.html this site].  Some experiments can be as simple as a spinning [[Alnico]] magnet<ref>modern magnets are even more powerful and can show the effect more easily.</ref> and a voltmeter, that can be performed on a tabletop in a science classroom.  Just a few of the more important ones will be described here.

There are hundreds of experiments or observations that, to varying extents, "prove", "validate", or "are consistent with" special and general relativity.  A good survey may be found at [http://math.ucr.edu/home/baez/physics/Relativity/SR/experiments.html this site].  Some experiments can be as simple as a spinning [[Alnico]] magnet<ref>http://www.naturalphilosophy.org/pdf/abstracts/abstracts_1213.pdf</ref><ref>modern magnets are even more powerful and can show the effect more easily.</ref> and a voltmeter, that can be performed on a tabletop in a science classroom.  Just a few of the more important ones will be described here.

===The [[Michelson-Morley experiment]]===

===The [[Michelson-Morley experiment]]===